Raikkonen F2007 champion paint color

The shade of red on the Ferrari F1 cars was never exactly the same through the decades especially when big time sponsors like Marlboro had influence. But otherwise a good question regarding the F2007 being so noticebly darker.

This is a cut-and-paste from an article I found:

Ferrari were the only team to receive tobacco sponsorship for the 2007 season. The team's principal sponsor is Philip Morris International, parent company of Marlboro cigarettes.[4] However, in order to circumvent the European tobacco advertising ban, the car's livery did not feature the brand name. A simple red and white "barcode" was used and, hence the advertising at European Grands Prix was purely through association. Ferrari used 'Marlboro' logos in Bahrain, Monaco and China.

The livery featured significantly less white than in previous years. The cars, driven by Felipe Massa and Kimi Räikkönen, raced with the numbers 5 and 6 respectively as the team finished second in the 2006 Constructors' Championship. Ordinarily, this would mean numbers 3 and 4 for the following season but owing to World Champion Fernando Alonso changing teams to McLaren, Renault received these numbers as Fernando Alonso took his number 1 (and thus, number 2) to his new team.

At the Monaco Grand Prix, Ferrari changed the colour of their cars from Marlboro (light) red to Rosso corsa (racing) red, and kept it for the duration of the season.[5][6]